The philosophy of occupational therapy has changed over the history of the profession. The philosophy articulated by the founders owed much to the ideals of romanticism, pragmatism and humanism which are collectively considered the fundamental ideologies of the past century.
The two main types of nucleic acids are deoxyribonucleic acid (DNA) and ribonucleic acid (RNA). DNA is the genetic material found in all living organisms and is found in the nucleus of eukaryotes and in the chloroplasts and mitochondria. In prokaryotes, the DNA is not enclosed in a membranous envelope.
There are three main types of Ribonucleic Acids: Ribosomal RNA (rRNA) is a major contituent of ribosomes, and consequently, it is fairly involved in the synthesis of proteins. It is produced in the nucleolus region of the nucleus. The most common type is messenger RNA (mRNA).